低炭素鋼の高温強度に及ぼす窒素の影響

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In the present experiment the effect of active nitrogen contents on creep rupture strength of low carbon steels was investigated. The materials were smelted in an atomosphere-controlled induction furnace of 50kg capacity, and the nitrogen contents from 0.004% to 0.03% were covered. Various tests were performed, tensile, bending, charpy impact, recrystallization and creep rupture, The results are as follows: 1. Tensile strength increased with increased active nitrogen content, while elongation and reduction of the area decreased. However, even if as much as 0.03% nitrogen (uncombined) was contained, the elongation and reduction of the area at room temperature remained quite adequate. namely,30% and 60% respectively. 2. Hot tensile strength in the range of blue shortness temperatures was found to be remarkably higher as compared with commercial steel. The strength increased with increased nitrogen content, while the elongation remained almost unaffected. 3. The transition temperature in charpy impact test became higher with increased nitrogen content as generally recognized. 4. The recrystallization temperature shifted slightly to the higher temperature side, as the nitrogen content increased. 5. The short-time rupture strength was found to be definitely improved effectively be nitrogen, thougth the strengthening effect of nitrogen appeared to decline at temperature above 500℃. Longer-time rupture tests are in progress, so that more comprehensive effects of nitrogen will be obtained.
社団法人日本材料学会の論文
1965-02-15

低炭素鋼の高温強度に及ぼす窒素の影響

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